diff --git a/docs/data/data-grid/localization/data.json b/docs/data/data-grid/localization/data.json
index 4540c7ebb4f2..663b4e2c1a8e 100644
--- a/docs/data/data-grid/localization/data.json
+++ b/docs/data/data-grid/localization/data.json
@@ -195,7 +195,7 @@
     "languageTag": "pt-PT",
     "importName": "ptPT",
     "localeName": "Portuguese",
-    "missingKeysCount": 4,
+    "missingKeysCount": 0,
     "totalKeysCount": 122,
     "githubLink": "https://github.com/mui/mui-x/blob/master/packages/x-data-grid/src/locales/ptPT.ts"
   },
diff --git a/packages/x-data-grid/src/locales/ptPT.ts b/packages/x-data-grid/src/locales/ptPT.ts
index 892802ec2cc4..1024917ed9c3 100644
--- a/packages/x-data-grid/src/locales/ptPT.ts
+++ b/packages/x-data-grid/src/locales/ptPT.ts
@@ -58,9 +58,9 @@ const ptPTGrid: Partial<GridLocaleText> = {
 
   // Filter operators text
   filterOperatorContains: 'contém',
-  // filterOperatorDoesNotContain: 'does not contain',
+  filterOperatorDoesNotContain: 'não contém',
   filterOperatorEquals: 'é igual a',
-  // filterOperatorDoesNotEqual: 'does not equal',
+  filterOperatorDoesNotEqual: 'não é igual a',
   filterOperatorStartsWith: 'começa com',
   filterOperatorEndsWith: 'termina com',
   filterOperatorIs: 'é',
@@ -81,9 +81,9 @@ const ptPTGrid: Partial<GridLocaleText> = {
 
   // Header filter operators text
   headerFilterOperatorContains: 'Contém',
-  // headerFilterOperatorDoesNotContain: 'Does not contain',
+  headerFilterOperatorDoesNotContain: 'Não contém',
   headerFilterOperatorEquals: 'É igual a',
-  // headerFilterOperatorDoesNotEqual: 'Does not equal',
+  headerFilterOperatorDoesNotEqual: 'Não é igual',
   headerFilterOperatorStartsWith: 'Começa com',
   headerFilterOperatorEndsWith: 'Termina com',
   headerFilterOperatorIs: 'É',